JP2000185116A - Die for injection molding of golf ball and method of manufacturing the golf ball - Google Patents
Die for injection molding of golf ball and method of manufacturing the golf ballInfo
- Publication number
- JP2000185116A JP2000185116A JP10363303A JP36330398A JP2000185116A JP 2000185116 A JP2000185116 A JP 2000185116A JP 10363303 A JP10363303 A JP 10363303A JP 36330398 A JP36330398 A JP 36330398A JP 2000185116 A JP2000185116 A JP 2000185116A
- Authority
- JP
- Japan
- Prior art keywords
- golf ball
- cross
- gate
- sectional area
- solidified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 239000012768 molten material Substances 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 18
- 238000005520 cutting process Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14819—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being completely encapsulated
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ゲートチップなど
を防止して生産性を向上しうるゴルフボール射出成形用
金型およびゴルフボールの製造方法に関し、特にゴルフ
ボールのコアを被覆する樹脂カバーを射出成形するのに
好適なものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball injection mold and a method of manufacturing a golf ball, which can improve productivity by preventing gate chips and the like, and more particularly to a resin cover for covering a golf ball core. It relates to a material suitable for injection molding.
【０００２】[0002]
【従来の技術】従来、例えばコアの外側に樹脂からなる
カバー層を形成してゴルフボールを製造する場合、図
６、およびそれを分割面ｂから見た図７に示す如く、上
下に接離可能な一対の割型ａ１、ａ２からなる金型ａが
用いられる。前記各割型ａ１、ａ２は、分割面ｂが当接
することにより、ゴルフボールの外表面を成形しうる球
状のキャビティｃと、このキャビティｃの外側に同心円
状で配されるリング状ランナー部ｄと、このリング状ラ
ンナー部ｄに一端が接続されて該リング状ランナー部ｄ
に溶融材料を供給する主ランナー部ｅ（図７に示す）
と、一端が前記キャビティｃで開口しかつ他端が前記リ
ング状ランナー部ｄに連通する横断面積を絞った複数個
のゲートｇとを具える。なお前記リング状ランナー部ｅ
は、その内周部に、円周方向の材料の流れを半径方向へ
と導くノズル部ｆを含む。2. Description of the Related Art Conventionally, when a golf ball is manufactured by forming a cover layer made of resin on the outside of a core, as shown in FIG. 6 and FIG. A mold a including a pair of possible split dies a1 and a2 is used. Each of the split dies a1 and a2 has a spherical cavity c that can form the outer surface of the golf ball when the split surface b abuts thereon, and a ring-shaped runner portion d that is arranged concentrically outside the cavity c. And one end of the ring-shaped runner d is connected to the ring-shaped runner d.
Main runner part e (shown in FIG. 7) for supplying molten material to
And a plurality of gates g having one end opened in the cavity c and the other end communicating with the ring-shaped runner portion d and having a reduced cross-sectional area. The ring-shaped runner portion e
Includes a nozzle portion f that guides the flow of material in the circumferential direction in the radial direction on the inner peripheral portion.
【０００３】前記キャビティｃの中には、該キャビティ
ｃと中心を揃えてゴルフボールのコアｈが配置される。
そして、そのカバーとなる例えばアイオノマー樹脂等の
溶融材料は、前記主ランナー部ｅからリング状ランナー
部ｄへと導入されるとともに、各ノズル部ｆよりゲート
ｇを通り前記キャビティｃ内へと射出供給され、コアｈ
の回りを覆って固化する。A core h of a golf ball is arranged in the cavity c so as to be aligned with the center of the cavity c.
A molten material such as an ionomer resin serving as the cover is introduced from the main runner portion e to the ring-shaped runner portion d, and is injected and supplied from each nozzle portion f through the gate g into the cavity c. And core h
Around the solidification.
【０００４】ところで、このような金型ａにてゴルフボ
ールを製造した場合、成形後に型からゴルフボールを取
り外すと、図８に示す如く、ゴルフボールｉには、前記
リング状ランナー部ｄ、ノズル部ｆ及びゲートｇ内でそ
れぞれ残存しかつ固化したリング状固化物ｊおよび放射
状固化物ｋなども一体となって成形される。なお放射状
固化物ｋは、前記ノズル部ｆ内で固化した相対的に大径
のノズル固化物ｍと、前記ゲートｇ内で固化した小径の
ゲート固化物ｎとを含む。When a golf ball is manufactured using such a mold a, the golf ball i is removed from the mold after molding, as shown in FIG. The ring-shaped solid matter j and the radial solidified matter k remaining and solidified in the portion f and the gate g are integrally formed. The radial solidified material k includes a relatively large nozzle solidified material m solidified in the nozzle portion f and a small-diameter gate solidified material n solidified in the gate g.
【０００５】このような固化物ｊないしｋをゴルフボー
ルｉから除去するために、通常、図９に示すように、放
射状固化物ｋ、中でも横断面積が小さく剛性の小さいゲ
ート固化物ｎを断面Ｙなどにて切断ないし破断する、い
わゆるゲートカット処理が行われる。In order to remove such solidified materials j to k from the golf ball i, usually, as shown in FIG. 9, a radial solidified material k, in particular, a gate solidified material n having a small cross-sectional area and a small rigidity is cut into a section Y. For example, a so-called gate cut process of cutting or breaking is performed.
【０００６】[0006]
【発明が解決しようとする課題】ところが、前記ゲート
ｇは、通常、横断面積を小かつ一定としたままキャビテ
ィｃで開口しているため、ゴルフボールｉを金型ａから
取り外す脱型時や前記ゲートカット処理時においては、
ゲート固化物ｎとゴルフボールｉとの境界部ｐに大きな
応力が集中しやすくなる。このような応力集力は、前記
境界部ｐないしこれに非常に接近した位置でゲート固化
物ｎの破断をもたらし、ゴルフボールｉの表面がえぐれ
たり部分的に欠落した欠損部（以下、このような損傷を
「ゲートチップ」という。）を生じさせる場合がある。
このようなゲートチップは、外観不良としてゴルフボー
ルの生産性を低下させる不具合がある。However, since the gate g is usually opened in the cavity c with a small and constant cross-sectional area, the gate g is removed when the golf ball i is removed from the mold a. During gate cut processing,
Large stress tends to concentrate on the boundary portion p between the solidified gate n and the golf ball i. Such stress concentration causes breakage of the solidified gate n at the boundary portion p or at a position very close to the boundary portion p, so that the surface of the golf ball i is cleaved or partially missing (hereinafter, referred to as such Damage may be referred to as a “gate chip”).
Such a gate chip has a defect that the productivity of the golf ball is reduced as poor appearance.
【０００７】本発明は、このような問題点に鑑み案出な
されたもので、ゲートに、射出方向上流側に配される小
径部と、下流側に配されかつキャビティで開口するとと
もに横断面積を前記小径部よりも大としたフレア部とを
含ませることを基本として、ゴルフボールの表面にゲー
トチップが生じるのを抑制し前記問題点を解決しうるゴ
ルフボール射出成形用金型およびゴルフボールの製造方
法を提供することを目的としている。The present invention has been devised in view of such problems, and has a small-diameter portion arranged on the upstream side in the injection direction and a small-diameter portion arranged on the downstream side and opening in the cavity and having a cross-sectional area. A golf ball injection mold and a golf ball that can suppress the generation of a gate chip on the surface of a golf ball and solve the above-described problems, based on the fact that a flare portion larger than the small diameter portion is included. It is intended to provide a manufacturing method.
【０００８】[0008]
【課題を解決するための手段】本発明のうち請求項１記
載の発明は、ゴルフボールの外表面を成形しうる球状の
キャビテイと、一端が前記キャビティで開口しかつ他端
が溶融材料を供給されるランナーに連通する複数本のゲ
ートとを有するゴルフボール射出成形用金型であって、
前記ゲートは、射出方向上流側に配される小径部と、下
流側に配されかつ前記一端で開口するとともにこの一端
での射出方向と直角な横断面積が前記小径部の横断面積
よりも大であるフレア部とを含むことを特徴としてい
る。According to a first aspect of the present invention, there is provided a spherical cavity capable of forming an outer surface of a golf ball, and one end of which is open in the cavity and the other end supplies molten material. A golf ball injection molding mold having a plurality of gates communicating with a runner to be performed,
The gate has a small-diameter portion disposed on the upstream side in the injection direction and a downstream portion and is open at the one end, and a cross-sectional area at one end perpendicular to the injection direction is larger than a cross-sectional area of the small-diameter portion. It is characterized by including a certain flare portion.
【０００９】また前記フレア部は、前記一端での横断面
積（Ｓｆ）が、前記小径部の横断面積（Ｓｇ）の１．５
〜１６．０倍とすることが望ましい。The flared portion has a cross-sectional area (Sf) at one end which is 1.5 times the cross-sectional area (Sg) of the small diameter portion.
It is desirable to set it to 16.0 times.
【００１０】また、これらのゴルフボール射出成形用金
型を用いた成形工程を含むゴルフボールの製造方法とす
ることが望ましい。[0010] It is also desirable to provide a method for manufacturing a golf ball including a molding step using these golf ball injection molds.
【００１１】[0011]
【発明の実施の形態】以下本発明の実施の一形態を図面
に基づき説明する。図１には、本実施形態のゴルフボー
ル射出成形用金型（以下、単に「金型」ということがあ
る。）１の断面図を、図２には、その上部の割型１ａを
分割面Ｘから見た平面図を示している。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a golf ball injection mold (hereinafter sometimes simply referred to as “mold”) 1 of the present embodiment, and FIG. 2 shows a plan view as seen from X. FIG.
【００１２】本実施形態の金型１は、接離可能な一対の
割型１ａ、１ｂを有し、かつその分割面Ｘを当接させる
閉止により、ゴルフボールＢ（図３に略示）の外表面を
成形しうる球状のキャビティＣが形成される。また、前
記割型１ａ、１ｂの閉止により、本例ではキャビティＣ
を囲む同心円状のリング状ランナー部３と、このリング
状ランナー部３に一端が接続されて該リング状ランナー
部３に溶融材料を供給する主ランナー部２と、一端Ｓが
前記キャビティＣで開口しかつ他端Ｅが前記リング状ラ
ンナー部３に連通する複数のゲート５が形成されるもの
を例示している。The mold 1 of the present embodiment has a pair of split molds 1a and 1b which can be separated from each other, and is closed by bringing the divided surfaces X into contact with each other, so that the golf ball B (illustrated in FIG. 3) is closed. A spherical cavity C capable of molding the outer surface is formed. In addition, in this embodiment, the cavity C is closed by closing the split molds 1a and 1b.
, A main runner portion 2 having one end connected to the ring-shaped runner portion 3 and supplying a molten material to the ring-shaped runner portion 3, and one end S having an opening in the cavity C. In this example, a plurality of gates 5 whose other ends E communicate with the ring-shaped runner portion 3 are formed.
【００１３】前記キャビティＣは、配列設計されたボー
ル表面のディンプルを成形するための複数の突起（図示
せず）が形成される。なお前記金型１の分割面Ｘは、例
えば前記キャビティＣの球中心を通る平面をなす。この
ため本例の各割型１ａ、１ｂには、前記キャビティＣを
２分割した半球状のくぼみがそれぞれ形成されるものが
示される。なお図示していないが適宜のエアベントなど
が該キャビティＣへと接続されている。The cavity C is formed with a plurality of projections (not shown) for forming dimples on the surface of the ball, which are arranged and designed. The dividing surface X of the mold 1 is a plane passing through the center of the sphere of the cavity C, for example. For this reason, each of the split molds 1a and 1b of the present embodiment is shown to have a hemispherical cavity formed by dividing the cavity C into two. Although not shown, an appropriate air vent or the like is connected to the cavity C.
【００１４】前記リング状ランナー部３は、本例では連
続したリング状を例示しているが、例えば主ランナー部
２との接続口の反対側の部分に途切れ部を有していても
良い。また、本例では、リング状ランナー部３は、周方
向にのびるリング部３ａと、このリング部３ａの内周部
３ｉに、半径方向内側に小長さでのびるノズル部３ｂを
有するものを例示している。そして、これらの主ランナ
ー部２、リング状ランナー部３により溶融した成形材料
の主たる流路としてのランナーＲが形成される。またこ
れらのランナーＲの横断面は、種々の形状が採用でき
る。In the present embodiment, the ring-shaped runner portion 3 has a continuous ring shape. However, the ring-shaped runner portion 3 may have a discontinuous portion at a portion opposite to a connection port with the main runner portion 2. Further, in this example, the ring-shaped runner portion 3 has a ring portion 3a extending in the circumferential direction and a nozzle portion 3b extending a small length radially inward on the inner peripheral portion 3i of the ring portion 3a. are doing. The main runner 2 and the ring-shaped runner 3 form a runner R as a main flow path of the molten molding material. Also, the cross section of these runners R can take various shapes.
【００１５】前記ノズル部３ｂは、前記リング部３ａ内
を円周方向に流れる溶融材料を、放射方向内側、つまり
キャビティＣ側へと円滑に導きうる。このノズル部３ｂ
は、例えばリング部３ａの横断面積と同じか又は若干小
さな横断面積で形成され、射出方向の下流側となる前記
ゲート５に比べると大きな横断面積で形成され、該ゲー
ト５へと材料を送給しうる。なお本明細書において、横
断面積と言うときは、特に断りがない限り、溶融材料の
射出方向と直角な方向の断面積とする。The nozzle portion 3b can smoothly guide the molten material flowing in the ring portion 3a in the circumferential direction to the inside in the radial direction, that is, to the cavity C side. This nozzle part 3b
Is formed, for example, with a cross-sectional area that is the same as or slightly smaller than the cross-sectional area of the ring portion 3a, and is formed with a cross-sectional area that is larger than that of the gate 5 that is downstream in the injection direction. Can. In this specification, the term “cross-sectional area” refers to a cross-sectional area in a direction perpendicular to the injection direction of the molten material unless otherwise specified.
【００１６】前記ゲート５は、本例では前記リング部３
ａの円周方向に沿って隔設された複数本を例示してい
る。前記ゲート５の配設本数としては、例えば４〜１５
本、好ましくは６〜１０本程度が望ましく、本例では８
本を例示している。このゲート本数が過小のとき、射出
成形時の溶融材料の充填効率が低下する傾向があり、逆
に多すぎるとディンプルとの干渉が生じる虞がある。ま
たこれらのゲート５は、円周方向に等間隔で配されると
ともに、その射出方向がキャビティＣの中心を向く放射
状とするのが望ましい。In the present embodiment, the gate 5 is connected to the ring 3
3A illustrates a plurality of pieces separated along the circumferential direction of FIG. The number of the gates 5 is, for example, 4 to 15
, Preferably about 6 to 10, and in this example, 8
An example is a book. When the number of gates is too small, the filling efficiency of the molten material during injection molding tends to decrease. Conversely, when the number is too large, interference with dimples may occur. In addition, it is desirable that these gates 5 are arranged at equal intervals in the circumferential direction, and that the emission direction thereof is radially directed to the center of the cavity C.
【００１７】そして、本実施形態のゲート５は、図１、
図２に示す如く、射出方向の上流側に配される小径部５
ａと、下流側に配されかつ前記一端ＳでキャビティＣに
開口するとともにこの一端Ｓの横断面積Ｓｆが前記小径
部５ａの横断面積Ｓｇよりも大であるフレア部５ｂとか
ら構成されるものを例示している。The gate 5 of the present embodiment is the same as that shown in FIG.
As shown in FIG. 2, the small-diameter portion 5 arranged on the upstream side in the injection direction
and a flare portion 5b disposed on the downstream side and opening to the cavity C at the one end S and having a cross-sectional area Sf of the one end S larger than the cross-sectional area Sg of the small diameter portion 5a. An example is shown.
【００１８】前記小径部５ａは、その横断面積が前記ノ
ズル部４に比して絞りこまれ、かつ本例では軸方向に一
様であるものが例示される。また、その横断面形状は、
図５（ｂ）の如く横長矩形としたものを例示し、例えば
上部の割型１ａに凹設された窪みと、割型１ｂの分割面
Ｘとによって形成されているものを示す。また前記フレ
ア部５ｂは、前記一端Ｓにおいて、図５（ａ）に示すよ
うな半円状の断面形状のものを例示している。なお、フ
レア部５ｂは、前記小径部５ａとの接続部から横断面積
が漸増しているものを示す。The small-diameter portion 5a has a cross-sectional area narrower than that of the nozzle portion 4 and is uniform in the axial direction in this embodiment. Also, its cross-sectional shape is
FIG. 5B shows an example of a horizontally long rectangle, which is formed by, for example, a recess formed in the upper split mold 1a and a split surface X of the split mold 1b. The flare portion 5b has a semicircular cross-sectional shape as shown in FIG. The flare portion 5b has a cross section gradually increasing from the connection portion with the small diameter portion 5a.
【００１９】このため、図３に示すように、成形された
ゴルフボールＢは、リング部３ａ内で残存しかつ固化し
たリング状固化物１２、ノズル部３ｂ内で残存しかつ固
化したノズル固化物１１、更にゲート５内で残存しかつ
固化したゲート固化物１０とが一体的に形成される。こ
こで、前記ゲート固化物１０は、前記フレア部５ｂにて
固化したフレア固化物７と、前記小径部５ａにて固化す
ることにより前記フレア固化物１０よりも横断面積が小
の小径部固化物９とを含むものである。For this reason, as shown in FIG. 3, the molded golf ball B has a ring-shaped solidified material 12 remaining and solidified in the ring portion 3a, and a nozzle solidified material remaining and solidified in the nozzle portion 3b. 11, and the solidified gate material 10 remaining and solidified in the gate 5 is integrally formed. Here, the solidified gate 10 is a solidified flare 7 solidified in the flare portion 5b and a solidified small diameter portion having a smaller cross-sectional area than the solidified flare 10 by being solidified in the small diameter portion 5a. 9 is included.
【００２０】従って、図４に示すように、ゴルフボール
Ｂの外表面とゲート固化物１０との境界部Ｐ１は、前記
フレア固化物７によって補強することができる。他方、
フレア固化物７と小径部固化物９との境界部Ｐ２や、小
径部固化物９自体の剛性は、前記境界部Ｐ１に比して相
対的に小となる。このため、脱型時やゲートカット処理
時などでは、この境界部Ｐ２ないし小径固化物９で切断
されやすくなるため、ゲートチップの発生を効果的に防
止しうる。Accordingly, as shown in FIG. 4, the boundary P1 between the outer surface of the golf ball B and the solidified gate 10 can be reinforced by the solidified flare 7. On the other hand,
The rigidity of the boundary portion P2 between the flare solidified material 7 and the small diameter portion solidified material 9 and the rigidity of the small diameter portion solidified material 9 are relatively small as compared with the boundary portion P1. For this reason, at the time of demolding or gate cutting processing, the chip is easily cut at the boundary portion P2 or the small-diameter solidified material 9, so that generation of a gate chip can be effectively prevented.
【００２１】なお前記ゴルフボールＢの表面には、ゲー
トカット処理後もフレア固化物７が残存することとなる
が、これは、従来も行われていたバフ研磨処理やトリミ
ング処理などの工程において容易に除去することがで
き、これに伴う生産性の悪化といった不具合もない。The flare solidified material 7 remains on the surface of the golf ball B even after the gate cutting process. This can be easily achieved by a conventional process such as a buffing process or a trimming process. , And there is no problem such as a decrease in productivity due to this.
【００２２】また上述の効果は、前記フレア部５ｂの前
記一端Ｓでの横断面積Ｓｆを、例えば前記小径部５ａの
横断面積Ｓｇの１．５〜１６．０倍とすることにより、
さらに向上させることができる。The above-mentioned effect is obtained by setting the cross-sectional area Sf at the one end S of the flare portion 5b to, for example, 1.5 to 16.0 times the cross-sectional area Sg of the small diameter portion 5a.
It can be further improved.
【００２３】前記フレア部５ｂの前記横断面積Ｓｆが、
小径部５ａの横断面積Ｓｇの１．５倍未満のときには、
フレア部５ｂで固化するフレア固化物７によるゴルフボ
ール表面補強効果が相対的に低下していく傾向があり、
逆に１６．０倍を超えると、フレア固化物７がディンプ
ルと干渉したり、あるいはディンプルの設計自由度を阻
害したり、さらには研磨に時間を要するなどの問題を招
く虞がある。このような観点より、フレア部５ｂの前記
横断面積Ｓｆを、小径部５ａの横断面積Ｓｇの１．９〜
１０．０倍、さらに好ましくは１．９〜７．０倍とする
ことが望ましい。The cross-sectional area Sf of the flare portion 5b is
When the cross-sectional area Sg of the small diameter portion 5a is less than 1.5 times,
The golf ball surface reinforcing effect of the solidified flare 7 solidified in the flare portion 5b tends to relatively decrease,
On the other hand, when it exceeds 16.0 times, there is a possibility that the solidified flare 7 may interfere with the dimples, hinder the degree of freedom in designing the dimples, and may cause problems such as requiring a long time for polishing. From such a viewpoint, the cross-sectional area Sf of the flare portion 5b is set to 1.9 to less than the cross-sectional area Sg of the small diameter portion 5a.
It is desirably 10.0 times, more preferably 1.9 to 7.0 times.
【００２４】なお前記小径部５ａの横断面積Ｓｇが過度
に小であると、成形後に割型１ａ、１ｂを離間し、成型
品を脱型する時点で既に小径部固化物９などで切断さ
れ、成形品の一部が全型１内へと残り、成形サイクルが
中断されることが考えられる。またフレア部５ｂの横断
面積Ｓｆが小さすぎることにより、小径部５ａの横断面
積Ｓｇが過小にせざるを得ない場合がある。また小径部
５ａの横断面積Ｓｇが過大であると、これに応じてフレ
ア部５ｂの横断面積Ｓｆが大きくなってディンプルとの
干渉等が考えられる。If the cross-sectional area Sg of the small-diameter portion 5a is excessively small, the split dies 1a and 1b are separated after molding, and the molded product is already cut by the small-diameter portion solidified material 9 or the like at the time of demolding. It is conceivable that part of the molding remains in the entire mold 1 and the molding cycle is interrupted. Further, when the cross-sectional area Sf of the flare portion 5b is too small, the cross-sectional area Sg of the small diameter portion 5a may have to be made too small. If the cross-sectional area Sg of the small diameter portion 5a is excessively large, the cross-sectional area Sf of the flare portion 5b increases correspondingly, which may cause interference with the dimple.
【００２５】このような観点より、前記小径部５ａの横
断面積Ｓｇは、０．１２５〜０．９７５mm2 、より好ま
しくは０．２００〜０．８００mm2 とするのが望まし
い。同様に、フレア部５ｂの横断面積Ｓｆは、０．７〜
２．０mm2 、より好ましくは１．０〜１．７mm2 とする
のが望ましい。ただし、これらの数値範囲に限定される
ものではない。From such a viewpoint, it is desirable that the cross-sectional area Sg of the small diameter portion 5a is 0.125 to 0.975 mm 2 , more preferably 0.200 to 0.800 mm 2 . Similarly, the cross-sectional area Sf of the flare portion 5b is 0.7 to
2.0 mm 2, more preferably it is desirable to 1.0~1.7mm 2. However, it is not limited to these numerical ranges.
【００２６】また、前記小径部５ａ、フレア部５ｂの横
断面形状は、上記実施形態では図５（ｂ）と図５（ａ）
に示した矩形と半円形の組み合わせを例示したが、これ
に限定されることなく種々の組み合わせが可能である。
例えば、各小径部５ａ、フレア部５ｂの横断面形状は、
図５（ｃ）の如く三角形状、図５（ｄ）の如く四角形
状、さらには図示しない平行四辺形状、菱形状、楕円状
などをそれぞれに用いることができ、かつこれら小径部
５ａとフレア部５ｂに任意に用いて種々組み合わせて用
いても良い。In the above embodiment, the cross-sectional shapes of the small diameter portion 5a and the flare portion 5b are shown in FIGS. 5 (b) and 5 (a).
Although the combination of the rectangle and the semicircle shown in FIG. 1 has been exemplified, various combinations are possible without being limited to this.
For example, the cross-sectional shape of each small diameter portion 5a and flare portion 5b is as follows:
A triangular shape as shown in FIG. 5 (c), a square shape as shown in FIG. 5 (d), a parallelogram shape (not shown), a rhombus shape, an elliptical shape and the like can be used. 5b may be used arbitrarily and various combinations may be used.
【００２７】またゲート５は、好ましくはその一部が前
記分割面Ｘをなすか、又は、図５（ｅ）に示す如く、下
方の割型ａ２にもゲート５の一部を形成する窪みを凹設
して分割面Ｘを含んだ、分割面包含位置に設けるのが望
ましい。これによって、ゲート５はキャビティ２内に溶
融材料をバランス良く射出供給しうる点で好ましい。な
お、周方向に隣り合うゲート５を、割型１ａ側及び１ｂ
側の交互に形成しても良い。The gate 5 preferably has a part that forms the dividing plane X, or a recess forming a part of the gate 5 in the lower split mold a2 as shown in FIG. 5 (e). It is desirable to provide a concave portion at a position including the dividing surface including the dividing surface X. Thus, the gate 5 is preferable in that the molten material can be injected and supplied into the cavity 2 in a well-balanced manner. In addition, the gate 5 adjacent in the circumferential direction is connected to the split mold 1a side and 1b.
The sides may be formed alternately.
【００２８】本実施形態の金型１は、従来とほぼ同様の
手順で射出成形による成形工程を行うことにより、２な
いし４ピースといったゴルフボールのカバーを特に好適
に成形しうる。そして、ゲートカット、研磨等の処理を
行うことによりゴルフボールを製造しうる。また本実施
形態の金型１ないし製造方法は、糸巻きコアの回りに射
出成形によりカバーを成形することは勿論のこと、ワン
ピースのソリッドゴルフボールを射出成形する場合にも
適用しうる。The mold 1 of the present embodiment can particularly suitably mold a golf ball cover of 2 to 4 pieces by performing a molding step by injection molding in substantially the same procedure as in the past. Then, a golf ball can be manufactured by performing processes such as gate cutting and polishing. The mold 1 or the manufacturing method of the present embodiment can be applied not only to forming a cover around the wound core by injection molding but also to injection molding a one-piece solid golf ball.
【００２９】さらに、上記実施形態で説明したランナー
Ｒ、ノズル４、金型の分割面Ｘの位置、ゲート５の本
数、その断面形状などについては例示であって、種々の
構成によって置換、変更を行うことができるのは言うま
でもなく、また公知の冷却構造などを付加しうることは
勿論である。Furthermore, the runner R, the nozzle 4, the position of the dividing surface X of the mold, the number of gates 5, the cross-sectional shape thereof, and the like described in the above embodiment are merely examples, and may be replaced or changed by various configurations. Needless to say, it can be performed, and a known cooling structure or the like can be added.
【００３０】[0030]
【実施例】本発明の効果を確認するために、ポリブタジ
エンを基材ゴムとした加硫ゴムからなる直径３９mmのコ
アを前記金型のキャビティ内にセットし、その回りにア
イオノマー樹脂からなる溶融材料を射出供給してカバー
を成形するとともに、これを脱型後、ゲートカット処
理、バフ研磨処理して直径４２．７mmのゴルフボールを
製造した。そして、これらのゴルフボールの外観を観察
してゲートチップの有無を調べた。テストの結果を表１
に示す。EXAMPLES In order to confirm the effects of the present invention, a core having a diameter of 39 mm made of vulcanized rubber using polybutadiene as a base rubber was set in the cavity of the mold, and a molten material made of an ionomer resin was surrounded therearound. Was injected and supplied to form a cover, which was removed from the mold, then subjected to a gate cutting treatment and a buff polishing treatment to produce a golf ball having a diameter of 42.7 mm. Then, the appearance of these golf balls was observed to check for the presence of a gate chip. Table 1 shows the test results.
Shown in
【００３１】[0031]
【表１】 [Table 1]
【００３２】テストの結果、実施例のものは、ゲートチ
ップが全く発生していないことが確認できた。このよう
に本発明を実施した場合には、従来に比べて不良率を大
幅に低減しうる。As a result of the test, it was confirmed that no gate chip was generated in the embodiment. When the present invention is implemented in this way, the defective rate can be significantly reduced as compared with the related art.
【００３３】[0033]
【発明の効果】以上説明したように請求項１記載の発明
では、ゲートが、射出方向上流側に配される小径部と、
下流側に配されかつ前記一端で開口するとともに該一端
での横断面積が小径部よりも大であるフレア部とを含ん
でいるため、成形後のゴルフボールの外表面は、フレア
部で固化した横断面積が相対的に大きいフレア固化物を
介してフレア固化物よりも断面積の小さい小径部固化物
が一体的に成形される。従って、ゴルフボールの外表面
はフレア固化物で補強される反面、小径固化部は剛性が
小となって破断容易となるため、ゴルフボールの外表面
が欠損するゲートチップを確実に防止でき、製造時の外
観不良などを低減しうる。またこのような金型を用いた
成形工程を含んでゴルフボールを製造することにより、
不良率などを低減でき、生産性を大幅に向上しうる。As described above, according to the first aspect of the present invention, the gate has the small diameter portion arranged on the upstream side in the injection direction,
The outer surface of the golf ball after molding was solidified at the flare portion because the outer surface of the golf ball was formed at the downstream side and opened at the one end and the cross-sectional area at the one end was larger than the small diameter portion. The solidified small-diameter portion having a smaller cross-sectional area than the solidified flare is formed integrally with the solidified flare having a relatively large cross-sectional area. Therefore, while the outer surface of the golf ball is reinforced with the flare solidified material, the small-diameter solidified portion has low rigidity and is easy to break, so that the gate chip in which the outer surface of the golf ball is damaged can be reliably prevented, and the manufacturing is completed. The appearance defect at the time can be reduced. In addition, by manufacturing a golf ball including a molding step using such a mold,
The defect rate can be reduced, and productivity can be greatly improved.
【図１】本発明の一実施形態を示す金型（閉止状態）の
断面図である。FIG. 1 is a sectional view of a mold (closed state) showing an embodiment of the present invention.
【図２】その分割面から上部の割型を見た平面図であ
る。FIG. 2 is a plan view showing an upper split mold from the split surface.
【図３】その金型により成形されたゴルフボールの斜視
図である。FIG. 3 is a perspective view of a golf ball formed by the mold.
【図４】その部分断面図である。FIG. 4 is a partial sectional view thereof.
【図５】（ａ）〜（ｅ）は、小径部又はフレア部の横断
面形状を例示する断面図である。FIGS. 5A to 5E are cross-sectional views illustrating a cross-sectional shape of a small-diameter portion or a flare portion.
【図６】従来の金型（閉止状態）の断面図である。FIG. 6 is a cross-sectional view of a conventional mold (closed state).
【図７】その分割面から上部の割型を見た平面図であ
る。FIG. 7 is a plan view of an upper split mold seen from the split surface.
【図８】その金型により成形されたゴルフボールの斜視
図である。FIG. 8 is a perspective view of a golf ball formed by the mold.
【図９】そのゲートカットを説明する部分断面図であ
る。FIG. 9 is a partial cross-sectional view illustrating the gate cut.
１ ゴルフボール射出成形用金型 １ａ、１ｂ 割型 ３ リング状ランナー部 ３ａ リング状ランナー部 ３ｂ ノズル部 ５ ゲート ５ａ 小径部 ５ｂ フレア部 ７ コア Ｂ ゴルフボール Ｅ ゲートの他端 Ｓ ゲートの一端 Ｃ キャビティ Ｒ ランナー REFERENCE SIGNS LIST 1 golf ball injection mold 1a, 1b split mold 3 ring runner 3a ring runner 3b nozzle 5 gate 5a small diameter portion 5b flare 7 core B golf ball E other end of gate S one end of gate C cavity R runner
Claims (3)
キャビテイと、一端が前記キャビティで開口しかつ他端
が溶融材料を供給されるランナーに連通する複数本のゲ
ートとを有するゴルフボール射出成形用金型であって、 前記ゲートは、射出方向上流側に配される小径部と、下
流側に配されかつ前記一端で開口するとともにこの一端
での射出方向と直角な横断面積が前記小径部の横断面積
よりも大であるフレア部とを含むことを特徴とするゴル
フボール射出成形用金型。1. A golf ball injection device having a spherical cavity capable of forming an outer surface of a golf ball, and a plurality of gates having one end opened in the cavity and the other end communicating with a runner supplied with molten material. A molding die, wherein the gate has a small-diameter portion arranged on the upstream side in the injection direction, and a gate is arranged on the downstream side and opens at the one end, and a cross-sectional area perpendicular to the injection direction at this one end has the small diameter. And a flare portion that is larger than the cross-sectional area of the portion.
（Ｓｆ）が、前記小径部の横断面積（Ｓｇ）の１．５〜
１６．０倍である請求項１記載のゴルフボール射出成形
用金型。2. A cross-sectional area (Sf) at the one end of the flare portion is 1.5 to 1.5 times a cross-sectional area (Sg) of the small diameter portion.
The golf ball injection mold according to claim 1, wherein the ratio is 16.0 times.
形用金型を用いた成形工程を含むゴルフボールの製造方
法。3. A method for manufacturing a golf ball, comprising a molding step using the mold for injection molding of a golf ball according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36330398A JP3664427B2 (en) | 1998-12-21 | 1998-12-21 | Golf ball injection mold and golf ball manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36330398A JP3664427B2 (en) | 1998-12-21 | 1998-12-21 | Golf ball injection mold and golf ball manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000185116A true JP2000185116A (en) | 2000-07-04 |
| JP3664427B2 JP3664427B2 (en) | 2005-06-29 |
Family
ID=18478999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36330398A Expired - Lifetime JP3664427B2 (en) | 1998-12-21 | 1998-12-21 | Golf ball injection mold and golf ball manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3664427B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009034970A (en) * | 2007-08-03 | 2009-02-19 | Canon Inc | Molded article and electronic device |
| JP2011098480A (en) * | 2009-11-05 | 2011-05-19 | Aisan Industry Co Ltd | Method for producing throttle valve |
| JP2011136161A (en) * | 2009-12-29 | 2011-07-14 | Bridgestone Sports Co Ltd | Golf ball mold, golf ball and golf ball manufacturing method |
| JP2011136166A (en) * | 2009-12-29 | 2011-07-14 | Bridgestone Sports Co Ltd | Golf ball mold, golf ball and golf ball manufacturing method |
| JP2013212369A (en) * | 2012-03-30 | 2013-10-17 | Nike Internatl Ltd | Method of making golf ball |
| US9545741B2 (en) | 2012-03-30 | 2017-01-17 | Nike, Inc. | Method of making a golf ball |
| WO2021145047A1 (en) * | 2020-01-16 | 2021-07-22 | Nok株式会社 | Molding die and sealing member |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634438A (en) * | 1979-08-31 | 1981-04-06 | Dainippon Printing Co Ltd | Preparation of ping-pong ball |
| JPH09313648A (en) * | 1996-05-28 | 1997-12-09 | Bridgestone Sports Co Ltd | Metal mold for injection molding of golf ball and production of golf ball using this metal mold |
| JPH10127826A (en) * | 1996-11-01 | 1998-05-19 | Bridgestone Sports Co Ltd | Mold for injection molding of golf ball and manufacture of golf ball |
-
1998
- 1998-12-21 JP JP36330398A patent/JP3664427B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634438A (en) * | 1979-08-31 | 1981-04-06 | Dainippon Printing Co Ltd | Preparation of ping-pong ball |
| JPH09313648A (en) * | 1996-05-28 | 1997-12-09 | Bridgestone Sports Co Ltd | Metal mold for injection molding of golf ball and production of golf ball using this metal mold |
| JPH10127826A (en) * | 1996-11-01 | 1998-05-19 | Bridgestone Sports Co Ltd | Mold for injection molding of golf ball and manufacture of golf ball |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009034970A (en) * | 2007-08-03 | 2009-02-19 | Canon Inc | Molded article and electronic device |
| JP2011098480A (en) * | 2009-11-05 | 2011-05-19 | Aisan Industry Co Ltd | Method for producing throttle valve |
| JP2011136161A (en) * | 2009-12-29 | 2011-07-14 | Bridgestone Sports Co Ltd | Golf ball mold, golf ball and golf ball manufacturing method |
| JP2011136166A (en) * | 2009-12-29 | 2011-07-14 | Bridgestone Sports Co Ltd | Golf ball mold, golf ball and golf ball manufacturing method |
| US8083977B2 (en) * | 2009-12-29 | 2011-12-27 | Bridgestone Sports Co., Ltd. | Golf ball mold, golf ball and method of manufacturing a golf ball |
| JP2013212369A (en) * | 2012-03-30 | 2013-10-17 | Nike Internatl Ltd | Method of making golf ball |
| US9545741B2 (en) | 2012-03-30 | 2017-01-17 | Nike, Inc. | Method of making a golf ball |
| WO2021145047A1 (en) * | 2020-01-16 | 2021-07-22 | Nok株式会社 | Molding die and sealing member |
| JPWO2021145047A1 (en) * | 2020-01-16 | 2021-07-22 | ||
| JP7129575B2 (en) | 2020-01-16 | 2022-09-01 | Nok株式会社 | Forming molds and sealing parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3664427B2 (en) | 2005-06-29 |
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